Drug samples tested at the Massachusetts state police lab have been confirmed to be the deadly opioid known as carfentanil.

State police said Wednesday the crime lab analyzed substances seized by state police or other police agencies. Three samples tested positive for carfentanil, with two submitted by Brockton police and the third submitted by Transit police in the Quincy area.

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These confirmed tests represent the first carfentanil Massachusetts has seen. State police said they are not aware of any carfentanil overdose deaths in Massachusetts.

Several suspected overdose deaths in New Hampshire were confirmed to have been caused by carfentanil last month.

Carfentanil is around 100 times more potent than fentanyl and is deemed a danger to the public and first responders by police.

The drug is so powerful, it has has been used to sedate elephants weighing thousands of pounds and has no legitimate medical uses for humans. A small dosage of carfentanil could be fatal. Carfentanil is also known to be mixed with other drugs or disguised as heroin.

State police said the majority of carfentanil found in the United States have been produced in China and Mexico.